package com.example.a1demo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

  //     TextView tv_one=findViewById(R.id.tv_one);   //获取到text view空间
  //     tv_one.setText("leo");

    }
}